Ssempa was heavily involved in pushing this bill. However, it would seem that he had more than an evangelical notion of being an anti-gay crusader. According to certain accounts, Ssempa was using the bill and his notoriety of speaking out against lgbts to gain power and clout by attacking other pastors with accusations of homosexuality.

In 2012, he and five others ( Pastors Solomon Male, Michael Kyazze and Robert Kaira, Deborah Anita Kyomuhendo, and David
Mukalazi) were found guilty of a conspiracy to falsely accuse another pastor, Robert Kayanja of Rubaga Miracle Centre Cathedral, Kampala, of having sexual relations with men in his congregation.

According to Box Turtle Bulletin:

The guilty verdict stemmed from a May 2009 incident in
which Ssempa and the others engaged in a conspiracy to coerce a male
church member at Robert Kayanja’s Rubaga Miracle Center Cathedral to
claim that the parishioner had had sex with Kayanja.
The six were sentenced to a fine of one million Shillings each (about US$390) and one hundred hours of community service.

It is also alleged that through various unscrupulous means, Ssempa and company were attempting to get other men to claim that Kayanja was sodomizing them.

When it's all said and done, the discredited study by University of Texas professor Mark Regnerus will be seen as a pathetic last attempt by anti-gay groups to stop marriage equality via a nasty attack on same-sex families.

But for now, not many people - particularly in the lgbt community - know about this $800,00 flop or the effects it continues to have on the marriage equality fight. Nor are they aware that in spite of the fact that it has been discredited time and time again, anti-gay groups are determined to wring as much usage out of it as possible.

However, an excellent webpage gives you all you need to know.

I have to commend the Human Rights Campaign for The Regnerus Fallout, which looks at the junk science study, the players involved, how it has been discredited, and how anti-gay groups continue to misuse it, as well as an excellent timeline:

About Me

Alvin McEwen is 46-year-old African-American gay man who resides in Columbia, SC.
McEwen's blog, Holy Bullies and Headless Monsters, and writings have been mentioned by Americablog.com, Goodasyou.org, People for the American Way, PageOneQ.com, The Washington Post, Raw Story, The Advocate, Media Matters for America, Crooksandliars.com, Thinkprogress.org, Andrew Sullivan's Daily Dish, Melissa Harris-Perry, The Last Word with Lawrence O'Donnell, Newsweek, The Daily Beast, The Washington Blade, and Foxnews.com.
In addition, he is also a past contributor to Pam's House Blend,Justice For All, LGBTQ Nation, and Alternet.org. He is a present contributor to the Daily Kos and the Huffington Post,
He is the 2007 recipient of the Harriet Daniels Hancock Volunteer of the Year Award and the 2010 recipient of the Order of the Pink Palmetto from the SC Pride Movement as well as the 2009 recipient of the Audre Lorde/James Baldwin Civil Rights Activist Award from SC Black Pride. In addition, he is a three-time nominee of the Ed Madden Media Advocacy Award from SC Pride.